​x
 
<html>
<head>
<script type="text/javascript">
function mouseOver()
{
document.getElementById('b1').src ="/i/eg_mouse.jpg"
}
function mouseOut()
{
document.getElementById('b1').src ="/i/eg_mouse2.jpg"
}
</script>
</head>
​
<body>
<a href="http://www.w3school.com.cn" onmouseover="mouseOver()" onmouseout="mouseOut()">
<img alt="Visit W3School!" src="/i/eg_mouse2.jpg" id="b1" />
</a>
</body>
</html>
​